查询词典 fast fading

The simulation results show that this method has a good BER performance and is robust to fast fading channel.

仿真结果表明该信道跟踪方法具有良好的误码率性能，且对快衰落有很强的鲁棒性。

I cannot see what flowers are at my feet, Nor what soft incense hangs upon the boughs, But, in embalmed darkness, guess each sweet Wherewith the seasonable month endows The grass, the thicket, and the fruit-tree wild; White hawthorn, and the pastoral eglantine; Fast fading violets cover'd up in leaves; And mid-May's eldest child, The coming musk-rose, full of dewy wine, The murmurous haunt of flies on summer eves.

我不能看清是哪些花在我的脚旁，何种软香悬于高枝，但在温馨的暗处，猜测每一种甜蜜以其时令的赠与青草地、灌木丛、野果树白山楂和田园玫瑰；叶堆中易谢的紫罗兰；还有五与中旬的首出，这啜满了露酒的麝香蔷薇，夏夜蝇子嗡嗡的出没其中。

I cannot see what flowers are at my feet Nor what soft incense hangs upon the boughs But,in embalmed darkness,grass each sweet Wherewith the seasonable month endows The grass the thicket and the fruit-tree wild White hawthorn and the pastoral eglantine Fast fading violets coverd uo in leaves And mid-May's eldest child The coming musk-rose,full of dewy wine The murmurous haunt of flies on the summer eves Ⅵ.

我看不出是哪种花草在脚旁，什么清香的花挂在树枝上；在温馨的幽暗里，我只能猜想这个时令该把哪种芬芳赋予这棵树，林莽和草丛，这白枳花，和田野的玫瑰，这绿叶堆中易谢的紫罗兰，还有五月中旬的骄宠，这缀满了露酒的麝香蔷薇，它成了夏夜蚊蚋的嗡吟的港湾。

I cannot see what flowers are at my feet,br Nor what soft incense hangs upon the boughs,br But, in embalmed darkness, guess each sweetbr Wherewith the seasonable month endowsbr The grass, the thicket, and the fruit-tree wild;br White hawthorn, and the pastoral eglantine;br Fast fading violets cover'd up in leaves;br And mid-May's eldest child,br The coming musk-rose, full of dewy wine,br The murmurous haunt of flies on summer eves.br

我看不清是哪些花在我的脚旁，br 又何种软香悬于高枝，br 但在温馨的暗处，猜测每一种甜蜜br 以其时令的赠与br 青草地、灌木丛、野果树br 白山楂和田园玫瑰；br 叶堆中易谢的紫罗兰；br 还有五月中旬的首出，br 這沾满了如酒般的露水，即將綻開帶有麝香的玫瑰，br 夏夜蠅蟲嗡嗡的盤旋其中。

Doppler frequency offsets in rapid mobile environments result in both the fast fading of radio channels and intercarrier interference in Orthogonal Frequency Division Multiplexing systems. In order to combat the impact of ICI on OFDM systems in fast fading channels, an ICI mitigation technique is proposed in this paper.

针对高速移动环境下多普勒频偏造成移动信道的快衰落和正交频分复用系统中子载波间干扰问题，提出了一种适合快衰落环境的OFDM系统子载波间干扰抑制算法。

In this dissertation , the fading status of several mid-temperature vinyl sulphone reactive dyes with different color and relatively low cost in light and perspiration has been tested according to the ATTS standard. A team of three prime color reactive dyes with high light-perspiration fastness (Levafix Fast Red CA、Reactive Yellow 3RS、Reactive Navy RGB) has been selected and the influence of different dyeing process parameter on their match performance were studied and finally the proper normal dyeing process was confirmed.

其次，本文从实际应用角度出发按照ATTS汗液标准测定了一些不同色相的成本相对较低的中温型含乙烯砜活性基的活性染料在光照及汗液组分作用下的褪色情况，从中筛选出了具有较高耐光汗复合色牢度的活性染料三原色Levafix Fast Red CA、活性黄3RS、活性藏青RGB，并研究了不同工艺参数对其配伍因子的影响，确定了常规最佳工艺。

Actually, the legacy of the fast-fading socialist ideology fading fast even in this last of the People's Paradises is less pervasive in the city than a surviving aura of the frenzied, sophisticated and doomed international society that flourished here between the world wars, when the Anglo-American International Settlement around the Bund, and the nearby French Concession, set the tone and the reputation of Shanghai.

事实上，社会主义意识形态在迅速消逝（即便在这个最后的人民天堂中它也在迅速消逝），在这座城市中，其遗留下来的影响力，不及那种遗留下来的狂热、复杂、注定融于国际社会的氛围。在两次世界大战期间，这种氛围颇为盛行，当时，外滩周围的美欧公共租界以及附近的法租界，定下了这种基调，并成为上海的声誉所在。

Actually, the legacy of the fast-fading socialist ideology – fading fast even in this last of the People's Paradises – is less pervasive in the city than a surviving aura of the frenzied, sophisticated and doomed international society that flourished here between the world wars, when the Anglo-American International Settlement around the Bund, and the nearby French Concession, set the tone and the reputation of Shanghai.

事实上，社会主义意识形态在迅速消逝（即便在这个最后的人民天堂中它也在迅速消逝），在这座城市中，其遗留下来的影响力，不及那种遗留下来的狂热、复杂、注定融于国际社会的氛围。在两次世界大战期间，这种氛围颇为盛行，当时，外滩周围的美欧公共租界以及附近的法租界，定下了这种基调，并成为上海的声誉所在。让人兴奋的不安感觉

To demodulate the OFDM signals accurately, channel estimation algorithms are adopted. This paper examines the slow-fading estimation algorithms based on block pilot arrangement: LS and LMMSE algorithms, as well as the fast-fading channel estimation algorithms based on comb-type pilot arrangement: linear and transform domain interpolation algorithms.

本文分析了导频分布的两种方案：1块状导频分布，对基于块状导频分布方案的慢衰落信道估计算法：最小平方和线性最小均方误差算法进行了计算机仿真，比较了二者的估计性能，以及各自的优缺点；2梳状导频分布，对基于这种分布方案的快衰落信道估计算法进行了研究，对两类经典算法：线性插值法和基于变换域的插值法分别进行了理论分析和计算机仿真。

The paper investigates both block-type pilot linear minimum mean square error algorithm and IEEE802.16 OFDM channel estimation analysis. Simulation results confirm the block-type pilot structure is more suitable for IEEE802.16 system. An optimal pilot setting algorithm, based on space frequency domain, is explored and the pilot chart is presented. The proposed algorithm finds its application in MIMO-OFDM. Simulation results show the algorithm presents a good approximation to the perfect channel state information curve, with about 2dB difference in SNR. The simulation results also demonstrate the algorithm achieves fairly high stability in the environment of fast fading, performance of the proposed algorithm is better that of pilot training channel estimation.3. Taking into account the characteristics of IEEE802.16 OFDM system, OFDM system simulation platform is constructed in Matlab, exploiting simulink as a tool. OFDM modulation and demodulation simulation system are configured on LabVIEW platform. All the system signal processing is simulated, including defining system parameters, designing modulation model, and verifying all the proposed algorithms under different environments, such as white Gaussian noise, multi-path fading, with or without guard interval etc. Bit error performance is evaluated. The research provides valid theoretical basis for practical OFDM system performance evaluation.4. Taking advantage of software radio, the paper designs a hardware platform with both 256-IFFT/FFT and 512-IFFT/FFT OFDM schemes co-existing in one platform. You can predetermine one from the two schemes to carry out almost the same model function with different system performance and parameter setting.5. Referring to IEEE802.16 standard, the paper proposes a design method for generating signals and frames suitable for laboratory investigations implemented in laboratory environment.6. Based on 6701evm digital evaluation card, combined with analogy front-end, the paper designs a DSP software model to deal with baseband signal processing. An overall OFDM scheme, with modulation and demodulation function, is accomplished.

讨论分析了MIMO-OFDM中一种基于空频域的最优导频设置算法，给出了导频图案，通过仿真实验表明，该算法与理想的信道状态信息曲线非常接近，信噪比差距约在2dB左右，并且在快衰落条件下具有较好的稳定性，其性能要优于基于前导训练的信道估计方法。3、根据IEEE802.16OFDM系统特点，论文分别在Matlab中应用Simulink工具构建OFDM系统仿真平台、在LabVIEW平台上实现了OFDM调制解调仿真系统，模拟了整个系统的信号流程，进行了OFDM仿真系统参数的选择和调制模块的仿真设计、论证各算法性能，并根据各种不同的条件：例如高斯噪声、多径衰落、有无保护间隔等，对系统的误码特性进行了评估，为正确评价实际OFDM系统的性能提供了有效的理论依据。4、论文以软件无线电思想作为指导，提出了以256点IFFT／FFT为核心和以512点IFFT／FFT为核心的两种OFDM算法模式并存于同一个硬件平台、且可预选的方案，它们在参数选取和性能指标上有所差异，均实现了相似的模块和功能。5、论文参考IEEE 802.16无线网络标准的参数设置，针对本设计系统的应用环境和系统硬件的性能速率，提出了一种应用于实验室环境的信号结构、帧格式等参数设计。6、论文基于TI公司的6701evm数字评估板卡，结合模拟前端搭建数字中频平台，设计了基带处理的DSP软件模块并进行系统调试，基本实现了一套完整的OFDM调制解调方案。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了